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Mortgage Loans - Mortgage Loans Held for Sale Textual (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Loans Receivable [Line Items] |  |  |
Payments for Origination of Mortgage Loans Held-for-sale | $ 21,200.0 | $ 19,500.0 | $ 16,000.0
Proceeds from Sale of Mortgage Loans Held-for-sale | 21,000.0 | 18,900.0 | 15,500.0
Net gain on sales of loans | 538.4 | 561.7 | $ 619.1
Mortgage loans held for sale | 2,519.9 | 2,386.0 |
Mortgage loans held for sale, principal amount | 2,600.0 | 2,500.0 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |
Loans Receivable [Line Items] |  |  |
Mortgage loans held for sale | 2,469.1 | 2,356.1 |
Loan Origination Commitments [Member] |  |  |
Loans Receivable [Line Items] |  |  |
Derivative, Notional Amount | 1,100.0 | 532.4 |
Loan Origination Commitments [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |
Loans Receivable [Line Items] |  |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net | $ 15.7 | 4.8 |
Other Customer [Member] | Mortgage Loans | Customer Concentration Risk |  |  |
Loans Receivable [Line Items] |  |  |
Concentration Risk, Percentage | 34.00% |  |
Loans Sold to FNMA or securities backed by GNMA [Member] | Mortgage Loans | Customer Concentration Risk |  |  |
Loans Receivable [Line Items] |  |  |
Concentration Risk, Percentage | 64.00% |  |
Hedging Instruments Related To IRLCs [Member] |  |  |
Loans Receivable [Line Items] |  |  |
Derivative, Notional Amount | $ 2,600.0 | 3,800.0 |
Hedging Instruments Related To IRLCs [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |
Loans Receivable [Line Items] |  |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net | 137.9 | 317.8 |
Uncommitted Loans [Member] |  |  |
Loans Receivable [Line Items] |  |  |
Mortgage loans held for sale | $ 1,700.0 | $ 1,600.0 |

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